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Woolly aphids on crab apple bark. Pemphigus gall on cottonwood tree Grylloprociphilus imbricator on Fagus Galls made by Melaphis rhois. Woolly aphids (subfamily: Eriosomatinae) are sap-sucking insects that produce a filamentous waxy white covering which resembles cotton or wool. The adults are winged and move to new locations where they lay egg ...
Eriosoma lanigerum, the woolly apple aphid, woolly aphid or American blight, [1] is an aphid in the superfamily Aphidoidea in the order Hemiptera. It is a true bug and sucks sap from plants. It is a true bug and sucks sap from plants.
Some species of aphid, known as "woolly aphids" (Eriosomatinae), excrete a "fluffy wax coating" for protection. [29] The cabbage aphid, Brevicoryne brassicae, sequesters secondary metabolites from its host, stores them and releases chemicals that produce a violent chemical reaction and strong mustard oil smell to repel predators. [104]
When a cyclical parthenogenesis occurs, aphids reproduce sexually in the autumn and produce an overwintering egg, deposited on buds and bark crevices of the host plant. In spring the newly hatched nymphs develop in about two to three weeks and at least three molts to wingless, 2–3 mm large Fundatrix.
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The woolly elm aphid (Eriosoma americanum) is an aphid native to North America, found where Saskatoon (Amelanchier alnifolia) and American (Ulmus americana) elm trees are established. The aphid feeds on the Saskatoon elm in late spring through fall, and the American elm during both early spring and late fall.
Stegophylla essigi, also known as the California woolly oak aphid, is a species of North American aphid. [1] It had been found on many California oaks, including blue oaks, valley oaks, Oregon white oaks, coast live oaks, interior live oaks, California black oaks, and scrub oaks. [2] Woolly oak aphids overwinter as eggs.
Melaphis rhois is an aphid species first identified by Asa Fitch in 1866. [1] Known as the staghorn sumac aphid, it is the only species in the genus Melaphis. [2] It is a type of woolly aphid and one of the few aphids that induce the formation of galls. [3]: 758